Pump.



C. R. CURTIS.

PUMP.

APPLICATION FILED MAR.14.1914.

Patented 24, 1914.

2 SHEETS-SHEET l.

U. R. CURTIS.

PUMP. APPLICATION FILED MAR.14, 1914.

Patented Nov, 24, 1914.

2 SEEETSSHEET 2.

Witnesses.

lnvegzbsr. C. R Carma,

' a part of this specification and in which like FICE.

CLARENCE B. CURTIS, 0F GLENELLYN, ILLINOIS.

PUMP.

Specification of Letters Patent.

Patented Nov. 24, 1914.

Application filed March 14, 1914. Serial No. 824,682.

To all whom it may concern Be it known that I, CLARENCE R. CURTIS, a citizen of the United States residing at Glenellyn, in the county of bupage and State of Illinois, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

My invention relates to improvements in pumps of the general type embodying a movable or reciprocatory diaphragm which is moved in one direction by introducing pressure 11 on one side of the same or exhausting t e pressure therefrom, and has particular reference to such apparatus provided with novel and simple means operating in a quick and reliab e manner to supply or exhaust pressure to or from one side of the diaphragm.

An important object of the invention is to provide apparatus of the above mentioned character, which is of simple construction, cheap to manufacture, automatic and reliable in operation, strong, durable. and easy to repair.

A. further object of the invention is to pro vide novel and simple means for controlling the inlet and exhaust of nuid pressure into and out of the compression chamber of the same.

Other objects and advantages of this invention will be apparent during the course of the following description.

In the accompanying drawings forming numerals are employed to designate like parts throughout the same, Figure 1 is a central longitudinal sectional view through apparatus embodying my invention, Fig. 2 is a transverse sectional view taken on line 2-2 of Fig. I, Fig. 3 is a detail central a longitudinal sectional view through the pivoted crank, and, Fig. 4 is a fragmentary elevation of the same side of the lower portion of the apparatus.

In its preferred embodiment, my pump' comprises a main shell or casing 10 preferably formed in two parts 11 and 12, provided with flanges 13 connected by bolts 14 or the like.

The numeral 15 designates a flexible diaphragm, formed of any suitable material, such as leather, the same having its edge preferabl arranged between the flanges 13 and clamped thereto by means of the bolts 14'. It is thus Seen that the flexible diaphragm separates the eesifig paltis 11 and 12 forming a working chamber 16 below the diaphragm and a compression or pumping chamber 17 above the same. The casing-part 11 is preferably in the form of an upstanding cylinder 18, having its lower end open and its upper end closed by means of a head 19. This head is provided with an interior depending tubular element or boss 20 receiving the upper end of a reciprocatory rod 21, there preferably being a guide or bear-in ring 22 or the like interposed between t ese parts. The lower end 23 of the reciprocatory rod 21 enters a tubular extension 24 formed upon and depending from the lower casing-part 12, as'shown. A guide or bearing ring 25 or the like is preferably inter osed between the tubular extension 2 1 an the portion 23 of the rod 22, as shown. The reciprocatory rod 22 is provided at a point preferably substantially equi-distantly spaced from its ends with an enlarged screw-threaded portion 26, passing through an opening 27 formed through the diaphragm 15. Arranged upon the upper side of the diaphragm 15 is an apertured plate 28 and an apertured plate 29 is disposed below the same, such plates being clamped to the central portion of the diaphragm by means of clamping nuts 30, forming with the enlarged screw-threaded portion 26 of the reciprocatory rod an air tight connection. The diaphragm 15 is urged in one direction or downwardly by a preferably heavy compressible and expansible coil spring 31 having its lower end engaging the upper plate 28, the upper portion encircling the tubular boss 20, as shown.

The; numeral 32 designates a combined fluid inlet and outlet conduit, communicating with the compression or pumping chamber 17, preferably through the tubular portion 18. The conduit32 has connection with a T-coupling 33, provided at one end with a check-valve controlled fluid inlet pipe 34 and at its opposite end with a check-valye controlled fluid outlet pipe 35. It is thus seen that upon the. down stroke of the diaphragm 15, the fluid will pass from the pipe 34 into the pumping or compression chamber 17 and upon the up-stroke' of the diaphragm, will be compressed and discharged through the outlet pipe 35.

The numeral 36 designates a transverse rock-shaft, journaled through one side wall of the lower portion of the casing-part 12', and a smiling box 36 carried by a remov tively limited by fixed stops 37'. Arranged.

within the casing-part 12 and rigidly mounted upon the rock-shaft 36 is a crank 39, provided near its inner end with a shifting lug or extension 40, rigidly connected and preferably formed integral therewith.

The shitting lug 40 is arranged between and adapted to alternately engage lugs 41 and 42, carried by and preferably formed integral with one face of an oscillatory valve disk 43. which is pivotally mounted upon the rock-shaft 3G. The outer end of the crank 39 is forked and has its spaced arms preferably tapered to approximate the sha e of an arrow head, and disposed upon opposite sides of a reduced portion ofthe rod 21, between a pair of shoulders 44 to be alternately engaged and moved thereby. The crank 39 is engaged at one end by a coil spring 44, surrounding the shaft 36. and holding the same in engagement with a washer 45, said washer in turn holding the disk valve in proper slidable engagement with its seat.

The numeral 45 designates a fluid pressure inlet port, formed through the lower portion of the casing-part 12. the same being provided with ports 47 adapted to have free communication with the chamber 16, when ports 48 formed in the disk valve 43 are brought into registration therewith. The casing-part 12 is provided with an outlet port 49, provided with ports 51 adapted to have free communication with the chamber 16 when ports o2 formed in the disk valve 43 are brought into registration therewith. It is obvious that ports 45 and 49 are con nected with inlet and outlet pipes, not shown.

The operation of the apparatus is as follows :\Vhen the fluid pressure within the working chamber 16 moves thr' diaphragm 15 upwardly suiliciently, as shown in Fig. 1, the lower shoulder 44 engages the crank 39, swinging the same upwardly a suflicient distance to turn the rock-shaft 36 for swinging the crank 37 to the right past dead center, whereby the spring 38 will quickly complete the swinging movement of the crank 37 to the right, such movement being positively limited when the crank 37 engages the stop 37 Upon this swinging moverntnt of the crank 39, the lug 40 thereof is swung 1,1 mesa downwardly into engagement with the lug 41 carried by the disk valve 43, whereby the disk valve is turned to bring ports 51 and 52 into registration. Pressure within the working cylinder 16 is now exhausted from the same through ports 52, 51 and 50. When the pressure within the working chamber 16 is sufiiciently reduced, the spring 31 expands forcing the diaphragm 15 downwardly. This movement of the diaphragm causes the rod 21 to move downwardly, which through the medium of the upper shoulder 44, swings the crank 33) downwardly sufficiently to turn the rock-shaft 36 in a direction to swing the crank 37 to the left past dead center. W hen this takes place the spring 38 quickly com pletes the swinging movement of the crank 37 to the left, such mm .aient being positively limited by the engagement of the crank with the stop 37. Upon this turning movement of the crank 39, the lug 40 will engage the lug 42, to turn the disk valve 43 to bring ports 48 into registration with ports 47, ports 52 being sin'iultaneously moved out of registration with ports 51. It is obvious that the fluid pressure will now pass through port 45, ports 47, and ports 48 into the chamber 16,, to again elevate the diaphragm 15. It is thought that the pumping operation occurring above the diaphragm 15 is so obvious that no further explanation of the same is necessary.

It is to be understood that theform of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the suboined claims.

Having thus described my invention, I claim 1. In a pump of the character described, a pumping chamber-casing provided with a reduced tubular extension, :1 working -cham her-casing connected therewith, a flexible diaphragm arranged between the pumping and working chambers, a reciprocatory rod arranged within the pumping and working chambers and connected with the diaphragm, a coil spring arranged within the reduced tubular extension of the pumping chamber-casing and engaging the diaphragm to move'it through its return stroke, a pivoted valve arranged to control the inlet, and outlet of pressure to and from the working chamber, and a crank connected with the pivoted valve and moved by the reciprocatory rod.

2. In a pump of the character described, a main casing provided with inlet and outlet ports, a diaphragm dividing the main casing into pumping and working chambers, a rock-shaft journaled through the walls of the working chamber near the ports,

a disk valve pivotally connected with the rock-shaft and provided with ports adapted for movement into and out of registration with the first named ports, spring operated means adapted to turn the rock-shaft in either direction, a crank rigidly mounted upon the rock-shaft and provided near its inner end with an operating lug, spaced lugs formed upon the disk valve and arranged upon opposite sides of the first named lug, a reciprocatoryrod connected with the diaphragm and operating the crank, and a spring engaging the diaphragm to move the same through its return stroke.

3. In a pump of the character described, a main casing provided with inlet and outlet ports, adiaphragm dividing the main casing into pumping and working chambers, a rock-shaft journaled through the walls of the working chamber and arranged near the ports, a disk valve pivotally connected with the rock-shaft and provided with orts adapted for movement into and out 0 registration with the first named ports, a crank rigidly connected with one end of the rockshaft and arranged exteriorly of the work ing chamber, a spring connected with the crank to swing the same in either direction when moved in such direction past dead center, a second crank rigidly mounted upon the rock-shaft and arranged within the working chamber and provided near its inner end with a laterally extending lug, spaced lugs carried by the disk valve and arranged upon opposite sides of the first named lug, a reciprocatory rod connected with the diaphragm, operative connecting means between the reciprocatory rod and the pivoted crank, and a spring engaging the diaphragm to move the same in one direction.

In testimony whereof I aifix my signature in presence of two witnesses.

CLARENCE R. CURTIS.

Witnesses:

EDGAR H; McCHEsNEY,

J. D. MoOHEsNEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 13. C."- 

